<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <script type="text/javascript" src="../jquery-3.6.0.js"></script>
    <title>操作对象</title>
</head>
<body>
    <div id="div"></div>
    <input type="button" id="btn1" value="添加一个span到div"> <br><br><br>

    <input type="button" id="btn2" value="将加油添加到城市列表最下方"> &nbsp;&nbsp;&nbsp;
    <input type="button" id="btn3" value="将加油添加到城市列表最上方"> &nbsp;&nbsp;&nbsp;
    <input type="button" id="btn4" value="将雄起添加到上海下方"> &nbsp;&nbsp;&nbsp;
    <input type="button" id="btn5" value="将雄起添加到上海上方"> &nbsp;&nbsp;&nbsp;
    <ul id="city">
        <li id="bj">北京</li>
        <li id="sh">上海</li>
        <li id="gz">广州</li>
        <li id="sz">深圳</li>
    </ul>
    <ul id="desc">
        <li id="jy">加油</li>
        <li id="xq">雄起</li>
    </ul>  <br><br><br>
    <input type="button" id="btn6" value="将雄起删除"> &nbsp;&nbsp;&nbsp;
    <input type="button" id="btn7" value="将描述列表全部删除"> &nbsp;&nbsp;&nbsp;
    <script>
        // 按钮一：添加一个 span到 div
        
        //按钮二：将加油添加到城市列表最下方

        //按钮三：将加油添加到城市列表最上方

        //按钮四：将雄起添加到上海下方

        //按钮五：将雄起添加到上海上方

        //按钮六：将雄起删除

        //按钮七：将描述列表全部删除
    </script>
</body>
</html>